A4TECH HS-28i ComfortFit Stereo Headset

Style: On-the-Head
Product name: Stereo Headset
Frequency Response: 20 Hz ~ 20 KHz
Nominal Impedance: 32 ohms
Microphone Sensitivity: -58 db
Sensitivity: 105 dB±3 dB (at 1000 hz )
Speaker Diameter: F40 mm
Earphone / Microphone Plug: 3.5 mm Stereo
Controller: Volume knob on the headset